'The Descent' scared me sh1tless although there is some jumpy moments in it.
For a pretty disturbing horror, try 'mum and dad' it's a british indie film which obviously takes influences from Fred and Rosemary west.
For an 80's type of throwback horror 'Drag me to Hell' is awesome although not really scary
I love my horrors but hate anything with ghosts, they freak me out.
On Martrys, apparently it's just torture p0rn and non stop tension, meant to be really hard watching.